Electric radiator



C. V. STEVE NSON AND H. BURGESS.

ELECTI-HC RADMTOR. APPLICATION mu) JUNE 12. I918.

Patented May 11, 1920.

C" V. STEVENSON AND H. BURGESS. ELECTRIC RADIAIOR, ICATION FILED sum:

cncn. vmcmrr srsvnnsom or STATES PATENToFFIoE' SYDNEY, AND HENRYBURGESS, F PADDINGTON,

NEW SOUTH WALES, AU$TRALIA; SAID BURGESS ASSIGNOR T0 SAID STEVENSON.

1 ELECTRIC mnmron.

To all whom it may concern Be it known that we, Cnon; VINCENTSTEvENsoiw'and HENRY the King of Great Britain and Ireland, rc-

siding at 605 Geor e strccLSydney, in the State of New Sout WValcs,Commonwealth of Australia, and 182 Windsor street, Paddington, in theState aforesaid, respectively,

have invented certain new and useful I mprovements in ElectricRadiators, of which the following is a specification.-

' This invention relates to electric radiators employing heatingelements of a type comprising a cone of refractory material about 15which is a'helical groove in which is wound a coil of high electricalresistance which becoming heated by the passage of the current; impartsits heat to the cone, causing the lat ter to glow.

0 Andthe object of the invention is to effect certain improvements in orrelating to the;cone, its construction and attachment n 9 ns, and to theelectrical contacts, whereby tire intimate association of the heatingcoil with the cone is maintained despite the expansion ofthe former byheat, whereby. the fittin of the cone in a radiator is so sim Iified astorequireno expert knowledge so t at'new cones complete may-be suppliedseparately and fitted by any person 0 ordinary skil and intelligence,and whereby in con unctionwith a three way switch three variations ofheating efl'ect may be obtained with corresponding yariation of currentconsumption. r

With theseobjects, in view the invention consists: firstly in the form'ment'of the. groove or grooves about the cone and in the attachmentsrelating to the fitting of the cone in the in the arrangement ofelectrical contacts: and thirdly, 'in the provision where required ordesired of two separate grooves 'on the cone and a resistance coil ineach groove, the arrangement of the required connections, and theassociation therewith of a three way switch whereby said coils may beconinected in series or in parallel or one coil i-only-may be in use, togive minimum maximum or medium heating cflect respectively as may be,uired or desire( all substanially as hereinafter described with refernceto the acconmanying drawings, and ore particularly specified in theappended laims.

Specification of Letters Patent. Application Medium 12, 1916. Serial No.239,564.

Bnnonss, subjects of turned over the end and arrangcturned segment 25radiator; secondly,

Patented May 11, 1920.

In the drawings:-

F igure 1 is a perspective View of a radiator with heating elementsaccording to this Invention, having two resistance coils, and athree-way switch for regulating the heatin r effect.

ig. 2 is a part sectionalclevation of the radiator taken through thecone and its attachment, and also showing the three-way switch indiagrammatic form; and

Fig. 3 is a sectional elevation on line 8, 3, of Fig. 2. Fig. 4 being asimilar View on line 4, 4, of Fig. 2 looking in the reverse dircctiou.

Fig. 5 is a diagrammatic view of the wirmg arrangement and of thethree-way switch, one coil being shown heavier than the other, merelyfor the sake of distinction.

he cone is provided with a plug ll. attached thereto by metal ,bolts 12and 13' the nuts of which constitute terminals 14 and 15 heat insulatingwashers 16, 16, being interposed between said cone and plug so that thelatter is'kcpt comparatively cool. The plug 10 is provided peripherallywith a screw-thread of coarse pitch formed on a metal cylinder 17afiixcd to said plug in known manner and having a segment 18 inof theplug to underlie and make electrical contact with the diskhead 19.01bolt 12. The said cylinder 17 engages and makes electrical contact witha female threaded cylinder 20 secured within a cylimlrical socket 21.attached to the framing 22 of the radiator by bolts 23, 23, which alsohold the concave reflector 24. The threaded cylinder 20 has also aninwhich engages and makes with a stud 26 passina end of socket 21 and toelectrical contact through the closed which is attached a terminal 27.

The cone 10 is fitted at its larger and outer end with a grille 28 towhich is attached an axial rod 29, and on the exterior peri herv of saidcone is .ahelical 'zrroove single or double according to whether theradiator is of single or variable beat type), and of which the sides areparallel.

his construction 'of groove afi'ords greater depth comparatively towidth than with an ordinary V groove, the resistance coil or coils aremore snugly housed therein and when expanded by heat still remain inclose contact with the sides of the groove, and there is less liabilityof short circuit not ing by a convolution mounting its grooveand-contacting with an adjoining convolution.-

One of said resistance coils'31 is O0nl160t-' ed to terminal 14 on bolt12 and to the axialrod 29, while the other coil 32 is connected 37carrying on its rearward face an insulat ing r 38 of mica or otherappropriate materia whereby it is insulated from stud 26. The said ring37 is attached to and supported by a metal stud 39 enga ing a bored andthreaded boss integral witl said ring projectingthrough the socket 21and fitted externally thereof with a nut constituting a terminal 4.0. 1

The switch 41 has terminals A and B to which are respectively connectedthe main conductors C and D, and also has poles L, M and N. On saidterminals A, and Bare ivoted a pair of associated arms E and F, ihe'r'free ends being arranged to make contact with the 'said poles ashereinafter explained. The wirin arrangement from the switch 41 to theradiator (see Figs. 2 and 5) consists of a conductor P from terminal Bto terminal 49 a conductorjS from pole N to terminal 27 and a conductorT from poles L and M to terminal 35.

This wiring arrangement is suitable for alternating or direct current. i

In Fig. 1 the switch 41 is set with terminals A and B respectivelconnected to poles L and N, the current ow for that setting being byconductor T to terminal 35 sec et 34, re 29, resistance coil 31, bolt12, threaded cylinders 17 and 20 and stud 26 to terminal 27 switch polel4 arm F and terminal B and (or) vice versa; also the current flows fromterminal 35 throu h rod 29, resistance coil 32, bolt 13, plate a, stud39 to terminal 40, thence by conductor P to switch terminal B and(or)vice versa. In this setting the coils 31 and 32 are operated inparallel to produce maximum heating effect.

In Fig. 2 switch 41 is set with terminal A connected to pole, M, thecurrent flow being by conductor T to terminal 35, rod 29, coil 32, bolt13, ring 37, stud 39 and terminal 40, thence by conductor P to switchterminal B and (or) vice versa. In this setting one coil only isoperated, thus providing medium heating efi'ei-t.

In Fig. 5 switch 41 is set with terminal A connected to pole N thecurrent flow beonly to thence by conductor S toing b conductor 'S toterminal 27 thence as be ore through coil 31 to rod 29 (which however isout out), and from rod 29 through coil 82 as before to terminal 40thence b conductor P to switch terminal 13, and gr)vice versa. In thissetting the coils 31, 'nd 32 are operated in series to produce minimumheatln efl'ect.

It will be obvious that y eliminating terminal 40, stud 39 and ringcontact 37, and by employingone resistance coil only a d an appropriatesimple switch that the same general construction provides a single heatradiator.

It will also beobvious that the heating element comprising cone withcoil or coils, and plugewlth threaded cylinder, requires screwed home inthe socket, the necessary electrical contacts being automatically made.

What we claim and desire to secure by Letters Patent is: v

1. A heating element for an electric radiator, comprising a cone ofrefractory material having about its periphery a resistance coil laid ina helical groove, a plu of refractory material on the smaller en of saidcone, an externally threaded cylinder constituting a contact makingelement about said plug and having a segment inturned over the end ofsaid plug, through bolts connecting said plu and cone, one of said boltsengaging sai inturned segment and electrically connected to one end ofsaid coil, and in said plug a central rod constituting a contact makingelement electrirllally connected to the other end of said 001 2. Aheating element for an electric radiator, comprising a cone ofrefractory material havingS about its periphery two 'rethe smaller en[of said cone, an externally threadedmetalcylinder constituting acontact making'elementabout said plug and having a segment inturned overthe end of said plug, a pair of through bolts connecting said plug andcone, one of said bolts engaging said inturned segment and electricallyconnected to one end of one at said coils while one end of the othercoil is connected to the other bolt, and a central rod constituting acontact making element to which the other endsof said coils are connected.

3. A support having a socket, a sheet metal lining in the socket andformed with a screw thread, and a binding post on. said socket andsecuring said lin ng in place, in combination with a plug having a sheetmetal cylinder therearound provided with a threa to engage in that ofthe lining and with a bolt extending through the plug and heatingelement comprising a cone of refractory material and a resistance'coilon saidpone, the smaller end of the cone and in post to the said centralrod. jone end of the'coil being connected to the Signed at Sydney, N. S.Wales, this tenth 6 post, a central rod extending through the day ofMay, 1918.

cone. and through the core and connected to CECIL VINCENT STEVENSON.

HENRY BURGESS.

post on the socket, and means to detachabl? and electrically connectsaid second bin the other end of the coil, a. second binding

